London is preparing for what could be the hottest day of 2026 so far, with forecasts predicting temperatures of up to 28 degrees Celsius on Friday. This expected surge in warmth comes after an unusually cool May, during which temperatures largely remained below average for the time of year.
Heatwave Conditions Possible by Sunday
The warm weather is anticipated to settle over England and Wales, with the potential to persist into next week. However, cloud cover and scattered thundery showers might temper Saturday's heat. Met Office operational meteorologist Niamh Murray explained that if temperatures remain high, London could experience a heatwave by Sunday. The heatwave threshold for the capital at this time of year is defined as 28 degrees Celsius for three consecutive days in the same location.
Ms Murray stated: "If temperatures hold up on Saturday, we are expected to keep high pressure around into at least the first half of next week, so there is a potential that we may see those thresholds reached by the time we get to Sunday but... it's not 100% certain on that yet." She added that the contrast with the recent cool spell will make the weekend feel significantly warmer.
Regional Temperature Variations
Most of England and Wales, along with parts of Scotland, are expected to see above-average temperatures. The east coast could experience mid to high 20s Celsius, while Wales and western parts of northern England may reach 25 degrees Celsius. The hottest weather will be concentrated in the south-east, particularly around London and potentially into East Anglia.
For context, the UK-wide average high for this time of year is 15.5 degrees Celsius, and recent temperatures have peaked at around 14 degrees Celsius. The hottest day of the year so far was recorded on April 8, when temperatures reached 26.6 degrees Celsius in Kew Gardens, west London.
Outlook for the Rest of the Week
Further showers are forecast for Wednesday, though they will be lighter and more isolated, according to Ms Murray. Thursday is expected to start cloudy across the country, with some rain in Wales and parts of north-west England. However, the weather should brighten for many by the afternoon as clouds break up, particularly in southern regions.
